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- 0004 Logging instead of print The logging module gives every message a level, a timestamp and a destination you can change without editing code. It is the… Intermediate · Explains an idea · Any system Article Files & automation 15 Oct 2026
- 0021 Read and write files in Node.js with fs/promises A complete Node script that walks a folder, reads text files, and writes a JSON report safely, showing the everyday fs/promises calls… Beginner · Step by step · Any system Script Node.js 15 Oct 2026
- 0005 Dataclasses in depth @dataclass writes __init__, __repr__ and __eq__ for classes that mainly hold data. Learn defaults, default_factory, frozen and ordered classes, __post_init__ validation, slots… Advanced · Explains an idea · Any system Article Basics 15 Oct 2026
- 0022 Build a small Node.js CLI with util.parseArgs A complete, dependency-free command-line tool in Node: options and flags with parseArgs, input from files or a pipe, help text, and meaningful… Intermediate · Step by step · Any system Script Node.js 15 Oct 2026
- 0006 Testing with pytest: first tests, fixtures and parametrize pytest runs plain functions whose names start with test_ and reports every failing assert in detail. This guide covers setup, assertions, exceptions,… Intermediate · Step by step · Any system Article Testing 15 Oct 2026
- 0023 Run async tasks with a concurrency limit A small mapLimit helper that runs an async function over many items with at most N in flight, keeps result order, stops… Advanced · Step by step · Any system Script Async code 15 Oct 2026
- 0007 Fix: ModuleNotFoundError: No module named ‘…’ Python cannot find a module you import. Usually the package was installed into a different interpreter or virtual environment than the one… Beginner · Fixes an error · Any system Article Common errors · Environments & packages 15 Oct 2026
- 0024 TypeScript basics: types, interfaces, unions and narrowing TypeScript adds type annotations to JavaScript and checks them before your code runs. These are the core ideas you need to read… Beginner · Explains an idea · Any system Article Basics 15 Oct 2026
- 0008 Fix: TypeError: ‘NoneType’ object is not subscriptable You used [ ] on a value that is None. Something you expected to return a list, dict or match returned nothing.… Beginner · Fixes an error · Any system Article Common errors 15 Oct 2026
- 0025 Regular expressions cheat sheet (JavaScript flavor) The regex syntax you actually use, from character classes and quantifiers to groups, lookarounds and flags, with the JavaScript methods that apply… Beginner · Cheat sheet · Any system Article Basics · Basics 15 Oct 2026